import pandas as pd
pd.set_option('display.unicode.east_asian_width',True)
df=pd.DataFrame([['A','C','B'],['B','A','C'],['A','B','C'],['A','B','C']],colums=['a','b','c'])
print(':\n',df)
print(':\n',df.value_counts('a'))
print(':\n',df.value_counts('b',normalize=True,ascending=True))
print(':\n',df.value_counts())
print('describe():\n',df.describe?())